Lots of noise when using 360+TV headphone out and headphone amp

[viivo]

Using HDMI, and running the TV's headphone out to a headphone amp produces major noise at even the lowest volumes. Using just the headphones from the TV sounds fine. Using the 360's Component cables and RCA audio directly to headphone amp sounds clean and beautiful.

Is there any way I can use HDMI and the headphone amp at the same time? Is there something in the middle causing interference? Without the amp the TV's headphone out sounds fine.

if that's hard to understand, here it is:

360+Amp+TV out = noise
360+TV out = no noise
360+Component cables+Amp+TV = wonderful, but I like HDMI.

Edit: Specs in case they are needed:

Xbox 360
Evilfire Cmoy
Beyerdynamic DT 660
Sony Bravia

 

[vshah]

the tv is amplifying the headphones, so it is not a line level signal. your headphone amp is trying to amplify it further -> lots of noise.

have you tried leaving the component/rca xbox cable plugged into it, while having the hdmi connected to the TV? don't plug the component cables to anything, but plug the L+R audio cables to your headphone amp. try setting the sound output on the xbox to stereo as well.

are you using a receiver?

 

[viivo]

Thanks for the reply.

I ended up just removing the casing from the 360 component cables since MS designed it so you couldn't use it and a regular HDMI cable at the same time (and I'm certainly not spending $60 for Microsoft's "official" HDMI cables). It seems to work fine